The player reprises his role of Dr. Gordon Freeman, who must immediately face the repercussions of his actions in City 17.

The player reprises his role of Dr. Gordon Freeman, who must immediately face the repercussions of his actions in City 17 and the Citadel. Freeman reconnects with Alyx Vance and her robot, Dog, as they continue their support of the resistance's battle against the Combine forces trying to defeat them once and for all.

The intense, real-time gameplay delivered in Half-Life 2: Aftermath is made possible only by Source, Valve's proprietary engine technology which has been enhanced with new rendering technology and advanced artificial intelligence to deliver new levels of graphics and character interaction.

Here are some key features of "Half Life 2: Episode One Trailer":

· A new episode for one of the best-selling action games of all time.
· Reveals new secrets
· Franchise of over 18 million units sold worldwide
· Incredibly advanced Artificial Intelligence (AI)
· Highly detailed environments provide amazing gameplay settings
· Digital Actors: The most sophisticated in-game characters ever witnessed
· Physical Gameplay: Objects obey the laws of gravity, friction and buoyancy.
· Intense story line will appeal to those seeking more than another shooting gallery experience